Sofa



FIG. 1 is a top, front and left side perspective view of a sofa showing my new design;

FIG. 2 is a top, front and right side perspective view thereof;

FIG. 3 is a top, rear and left side perspective view thereof;

FIG. 4 is a top, rear and right side perspective view thereof;

FIG. 5 is a front elevational view thereof;

FIG. 6 is a rear elevational view thereof;

FIG. 7 is a left side view thereof;

FIG. 8 is a right side view thereof; and,

FIG. 9 is a top plan view thereof.

The broken lines in the drawings illustrate portions of the sofa which form no part of the claimed design. 

CLAIM The ornamental design for a sofa, as shown and described. 